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Pensions and Other Post-Employment Benefits - Summary of Pension and OPEB Costs (Detail) - CAD ($)
$ in Millions
 12 Months Ended
Dec. 31, 2021
Dec. 31, 2020
Dec. 31, 2019
Pension Benefits      
Disclosure of defined benefit plans [line items]      
Current Service Costs $ 16 $ 13 $ 11
Past Service Costs – Curtailments (1) 0 0
Net Interest Costs 3 3 3
Re-measurements:      
Return on Plan Assets (Excluding Interest Income) (9) (5) (15)
(Gains) Losses From Experience Adjustments 4 1 (4)
(Gains) Losses From Changes in Demographic Assumptions (1) 0 0
(Gains) Losses From Changes in Financial Assumptions (18) 15 12
Defined Benefit Plan Cost (Recovery) (6) 27 7
Defined Contribution Plan Cost 68 22 21
Total Plan Cost 62 49 28
OPEB      
Disclosure of defined benefit plans [line items]      
Current Service Costs 9 1 1
Past Service Costs – Curtailments (3) 0 0
Net Interest Costs 6 0 1
Re-measurements:      
Return on Plan Assets (Excluding Interest Income) 0 0 0
(Gains) Losses From Experience Adjustments 10 (2) 0
(Gains) Losses From Changes in Demographic Assumptions (3) 0 0
(Gains) Losses From Changes in Financial Assumptions (30) 1 1
Defined Benefit Plan Cost (Recovery) (11) 0 3
Defined Contribution Plan Cost 0 0 0
Total Plan Cost $ (11) $ 0 $ 3